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Unread 11-15-2011, 08:38 AM   #1
lewis09
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1977 CJ7 
 
Join Date: Apr 2007
Location: ohio
Posts: 61
hard time starting after sitting

My CJ has a 304 with motorcraft 2100, and when it sits for a day or two it has a hard time starting cause its not getting gas... After pumping the crap out of it and turning it over quite a bit it will start and be fine the rest of the day... So I am thinking I am losing fuel line pressure while it is sitting... I think I must have a leak in a fuel line somewhere, but before I go down that road I thought I would see if anybody else had some ideas

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Unread 11-15-2011, 05:42 PM   #2
wellmax
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1984 CJ7 
 
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Location: Hazel, KY
Posts: 1,090
look at your fuel filter, mine has one inlet and two outlets

center outlet goes to carb, outside one is an overflow and returns fuel back to tank.

it is suspose to be installed with the outside outlet in the top position.

have heard that if it's installed with the outside outlet at the bottom it can pull fuel back from carb into the tank.

next time you start jeep after its been sitting awhile, take breather off and pump carb, see if you have any fuel sprayed into carb, if not then fuel has been pull back into tank

I know when i corrected the position of the fuel filter, my jeep starts better.

This is not saying its starts right up after sitting for a week, but it turns over a number of times and fires off, but after its started once, then it fires off each time.

other idea is carb is leaking fuel down into motor, so you have raw gas on cyl walls as you try to start engine, not good, that is a carb problem and will have to be rebuilt.
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Unread 11-15-2011, 05:49 PM   #3
88Jeff94
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1988 YJ Wrangler 
 
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If it's anything like my yjs fuel filter there should be a check valve so that may have gone bad. Come to think of it I'm not sure where the check valve is but mine has a simmilar but less severe problem. As long as I pump the gas before I start cranking it works good. After sitting for a week it only takes a few extra cranks.
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Unread 11-15-2011, 05:58 PM   #4
Mike Romain
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1986 CJ7 
 
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The gas filter not level with the return not up top will for sure cause your symptoms. So will a pinhole leak between the pump and tank. The junk they now sell as gas will kill the rubber lines if stock and they crack and let air in causing the long cold starts. They are suction lines so they don't leak gas out unless real bad, just leave a stain.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 11-16-2011, 04:20 AM   #5
lewis09
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After looking at the fuel filter it only has one inlet and one outlet .... The return hose isn't connected to anything... Just sitting on top of the motor
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Unread 11-16-2011, 05:04 AM   #6
John Strenk
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Well then that's not your current problem but it will be good to put in the correct filter with 3 ports.

A weak fuel pump with dirty check valves could also cause your problem. It will allow the gas to leak back to the tank and have weak pressure when running. But even if you have no pressure in the fuel line your jeep should have enough fuel to start after sitting for a few days. even weeks.

Have you actually checked to see how much fuel is in the bowl? The 2100 makes it easy to pop the top and take a look. If it's not empty then look at accelerator pump or choke.

I had the darndest time starting mine starting after sitting until I replaced the pump. I replaced the pump because one day I saw it pumping gas out the side, not because it hurt performance. Magically the starting problem went away at the same time.
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Unread 11-16-2011, 05:27 AM   #7
Matt1981CJ7
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We had a similar thread not too long ago....hard cold starting, rough cold idle, had to nurse the throttle until it was warm, etc....

His electric choke wasn't hooked up. Sometimes we overlook the obvious.

Matt
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Unread 11-16-2011, 11:03 AM   #8
lewis09
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I will take a look tonight to see if I have fuel in the bowl... A new fuel pump would probably be a good idea as well... My electric choke is hooked up and works once I get it started
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Unread 11-16-2011, 05:35 PM   #9
Mike Romain
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Quote:
Originally Posted by lewis09 View Post
I will take a look tonight to see if I have fuel in the bowl... A new fuel pump would probably be a good idea as well... My electric choke is hooked up and works once I get it started
I would look for a leak first.

Be Very wary of the new POS fuel pumps they sell, I put one in just because I was rebuilding everything and the casting was bad so it let all the oil in my crankcase blow out on a highway run blowing my engine. By the time my mechanical gauge said 0 pressure, there was 0 oil left. Grr....
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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